The Queen of Mystery has come to Harper Collins! Agatha Christie, the acknowledged mistress of suspense--creator of indomitable sleuth Miss Marple, meticulous Belgian detective Hercule Poirot, and so many other unforgettable characters--brings her entire oeuvre of ingenious whodunits, locked room mysteries, and perplexing puzzles to audio. In her classic The Big Four, the great Poirot is caught up in a deadly game of international intrigue as he races to uncover the strange mystery of the"Number Four."Hercule Poirot faces international intrigue in this classic Agatha Christie mystery.Framed in the doorway of Hercule Poirot's bedroom stands an uninvited guest, coated from head to foot in dust. The man stares for a moment, then he sways and falls. Who is he? Is he suffering from shock or just exhaustion? Above all, what is the significance of the figure 4, scribbled over and over again on a sheet of paper?Poirot finds himself plunged into a world of international intrigue, risking his life--and that of his "twin brother"--to uncover the truth.